Kinetic Energy

• What is kinetic energy?

  Energy possessed due to motion
• What two factors determine the kinetic energy of an object?

  Speed and mass
• How does speed affect kinetic energy?

  Faster objects have more kinetic energy
• How does mass affect kinetic energy when speed is constant?

  More mass means more kinetic energy
• If a particle weighs 0.1 grams and a plane weighs 20 tons, which has more kinetic energy at the same speed?

  The plane has more kinetic energy
• What happens to kinetic energy if a plane travels at 5 m/s and a particle at 4000 m/s?

  We need to calculate using the equation
• What is the equation for kinetic energy?

  $E_k =$$\frac{1}{2} m v^2$
• What do the variables in the kinetic energy equation represent?

  E is energy, m is mass, v is velocity
• How do you convert 20 tons to kilograms?

  20 tons equals 20,000 kilograms
• How do you convert 0.1 grams to kilograms?

  0.1 grams equals 0.0001 kilograms
• What is the kinetic energy of the plane traveling at 5 m/s?

  250,000 joules or 250 kilojoules
• What is the kinetic energy of the particle traveling at 4000 m/s?

  800 joules or 0.8 kilojoules
• Why did the particle have less kinetic energy despite its higher speed?

  Its mass was much lower
• What is the relationship between speed, mass, and kinetic energy?

  • Kinetic energy increases with speed
  • Kinetic energy increases with mass
  • Higher mass at constant speed means more energy